实现发布订阅模式基础功能，可用于VUE3组件通讯
一个实现发布订阅/eventbus基础功能的练习Demo
当我尝试实现时遇到的问题
impor导入后,共享的对象却相同?答 :
import的执行是将代码静态引入,两次引入应该生成两个互不关联的作用域,事实上也确实如此。
之所以能够共享同一个对象，是因为node的模块机制，我们的代码最后如果打包到同一个chunk中，那么实际上mitt仅仅只执行了一次,而mitt内部会挂载一个全局对象,故而能够两次导入却共享同一对象内容,完成跨组件的发布和订阅.
| 文件名描述 | 描述 |
|---|---|
| a.js | 模块 |
| b.js | 模块 |
| bus.js | 事件中心 |
| mitter.js | 订阅发布工具 |
| x.js | 模块 |
mitter.add(事件名,函数) mitter.exec(事件名,参数)
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